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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b99837485d73c8960d954e7e832457ff4c5bd420c5771aa913684b0232e4834e' 
  AND token = 'g0q15X+A7M86YZsUxFqSH3sirn51hisiF6/6z4D/eAs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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