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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '18eb9782e0ae997ea485db14c1e167ffe07ede65a5d51eb7d4925122a6b144f9' 
  AND token = '907gdpLEf4y3V9Q27fb9aEq2SbpY/HoUMD6KTHrXubY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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