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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '61c22db3c0296fe5044c3725b8b82d3f0774b582139b64785bf1c82db8de7de4' 
  AND token = 'QVSJuBulvXNn1Q2NCj6D3xb8HsNQyqa1elBmAw0j9G4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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