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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'de2365913dc087e079c71dc4ae0f083bbf907e71a23772d5c1e03c5fd9470ea9' 
  AND token = 'SjICUiYuAdcKadyHWkAw1uyjI8Rf/qaz8FHsecTqs3o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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