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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f3110dd1ba3fa792efd26c688d8ae42aeef431315be65d1330db7473217cfe69' 
  AND token = 'bH+Bsrc+LekeHeNZTldiggmK5ZlzmpkOgsQEn+xyXE4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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