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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b11ad7bfd2dfbe710c6b3d74ba1f48c3dc6fd3448eaa53090f11178447be1765' 
  AND token = 'dJXhl5OwPIJc2Xfic/CZ2IvkN4SLiOTFIF3KS20j4Ew=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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