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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bf40a84d21ee9986b4f3c255f7be104b47d15b58dff631dc6bd6451c50c67967' 
  AND token = 'k4PXpV86EKqbReN3oW863BYbE/bgtUTYW9Cu5hgbiw8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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