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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6ef448026d9a724f4e40eff0ccdfb18dcd394351a19fa7c04518af944bc3232f' 
  AND token = 'gtLvB7wMLwikFXMsu4QXyQU0EL2c07/WY2ZMJhrVY30=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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