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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e84f58690854d5e54b27b29bbc1aad7a3cf0e705d1ece597c53cc1cdc78d2c1f' 
  AND token = 'aoVTHfBdnp9AtX0GrULIkJpK2ml/cbNf2DZ/fL4eLak=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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