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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'af61a13700784e572c4493a4ee10acad6a17edc1c3f9544b1e53c4d2cba42592' 
  AND token = 'dw2wK/JDNj45TmBl2PtJa2kF17Fbr6tanmWXJWPiTbU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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