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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0540872ed38e14fe5308c1fcdf99095a3c4b2eacdf7bffdeac4f7ab10af68f64' 
  AND token = '84VhQ8SfkXk8qkLQN4sG8/41zcRH0j8PRYg9HRLXkFk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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