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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ab1c21d54f0460a3a132c61f92bbd7987f356d83caf4dc2df31aff6e14f42dff' 
  AND token = 'nDiVJ6qYh4jN54nPUfXPThbp3lJrWiS8fhqYG9IruJw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}