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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '27b94e2ebf3c025e6d64b9d7e5d1683c05d11bc61f60b5a0503ba70806dcf15c' 
  AND token = 'OUaqLqNn9avK0r1vWQfAYkC2JFtjZ66YxnC+exZ2ibA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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