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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ceefbb0e5907f0e33c6e8d93b2fabccd1565c38e4eab204efcfc123cb65d76e1' 
  AND token = '8IEiprhGPQqEdUsbrs4+4PqWM6n7Z312/CWA7G8QSUw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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