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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd307670b0a84e57da7927ab12355e21dda0055d2d8886259c726ab4ff62b0b40' 
  AND token = 'HhUmBhqUKUMaVJW9GQtCD8RByny4r1CZu2auIoR6JmI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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