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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9d5958c5bea0c03beb5adea1187113bcf98a751c1776dfdebc27e5fc748e090a' 
  AND token = 'PThBMzbINlJSLs/NEJrokTYlWDuCxx/g9MSakQGT+Y8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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