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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '81d8c010d6c67032c6cfd5fd496597770986f16ef7ebd42adb9804ef8c6b167a' 
  AND token = '6TdNpZAja83ruVY0MdH4dhYcnOTU9bkVjbj1q1qiGLo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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