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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '818beb5a394cce0f47e43bd5de10cb7e5ef62003bbb4af978088d3a8557b70e7' 
  AND token = 'YqBriYpCIswq40YaRuapvJ0NCtvNwG5HU8eG/Mk559Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

JSON explain

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