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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd2ca1136d5a176d0361f4d781f93c3bde8e30788385365776852c987681e6bc4' 
  AND token = '2LdBv+TONUHRj94W4N8t9Wyf0UD8iprxBl2a6MQTtPE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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