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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '603c9d99b1aae037bd7613b99490d72c57816ccacd8b5b601664b6fe385565d4' 
  AND token = 'kFBnXvmHpx0N5ciu+Nmzh5lxqHxdc37+h8zklpzcl74=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00077

JSON explain

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