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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2d1a0ef6174f9c4619f7180ea0ebfe531ab5ea86958cfec32ea2543fa0d93574' 
  AND token = 'fgTyxQ5IKzMUHz1w3fJo05skgF1+Y3XJeMXH2di6iZc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00051

JSON explain

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