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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c11f92b65b3c50696feb58c6b6fdc29bc2e81fc38fa4a1e167cc612dc5077507' 
  AND token = 'eHxLuLA9+CAsBhhvR4lLZnVQQi01Cj/neuYmHY6U17U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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