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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '98e48eb4bb61ba36e6e7cbe283ae3fa0c778f017c15ab2e621e6904903c07f82' 
  AND token = '4BqJmVj9UQjAMZmdYFY8jQLQkrmhPwFyvdNWY5epiOA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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