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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ecb6cb7a77f1f95394e48499711fa33c3002958af491629e6294aaa61072003b' 
  AND token = '8fJlhS4upda9P1bK7sVw97aR5dw1ruvM9HgHyLbtslE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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