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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ecfeaae480f9ec651887cc3f1666b79251e55955cbea7838d989c8bf6db7157f' 
  AND token = 'r5za458QEtL4AQq4B/zqh9w7e21ZY6J6ngiwb8EPOVM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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