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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e99925a02e76cdf0b96c1518f8749e85ebcb0be679a35452f7f7beb4362f8a98' 
  AND token = '4SVu7Jxxcqrte64Ingnq/vtaLIASJ+aYtFsJXQrl92w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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