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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd0f851a41ed55ea88d285509bf8566ec9aeb7606fb5bd8ba92067bf936585e17' 
  AND token = 'aNnracN9wZUsYyuGnYNyD9BiRU2wXvZbHWI/sbwc22E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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