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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '768da3d89fd8c63bacb5016343f6e82c6791f1325a2c9988c81a4e95e20fc38c' 
  AND token = 'trGp0Whzocq7gKpk9WRyzR80toe0XfJT/WpQpqrorKY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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