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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dae5239cd69c1dcd27329457810d855e896f125ff23de8fbabda6bf72d15079d' 
  AND token = 'zT5t+1ggNwFrqZBiS/+8s546xOg2EdRU8YhNL3g8Ex8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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