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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '13910e4350b3b34fb7c0bd79ec3d81b42fb31b12a547f1c47bbba87809ae4377' 
  AND token = 'K0mvAgnsYwyyjClET0rW3TSA5iEgZpV3E0l7VWqGojw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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