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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '29f53dc126263eebc2add9d16cac4f8d41f8ce92e814fd01253c4de04c927fbf' 
  AND token = 'r0bqpypV8xmhSG7Y7bvEgAPOiIYbrFWd8m/Lb8b9YYA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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