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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dcd202479f4deaa550e217d8107a65a01f97259b294efd4b0c36cd717aee827c' 
  AND token = 'U2QbCU9CNVFYfL8paczSCbQCI0keKw9junM6b7QyvjA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00057

JSON explain

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