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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '94055b6550f0932016ed7388c36ff75ff761ea12ca88592101c26a55efd1490e' 
  AND token = 'AtCSWO7CHVDPHbfDXLCT3reES3/u5l9hi049ToqxfUw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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