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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ba23e4cbe750c5cb2a4467e46f6b42162531686cc10e6989cf009ce809e78232' 
  AND token = '3WC1QpbYVLcWCaxZml1T07HG9MeYo9iZVwUh7IR47/8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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