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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '36abb5c5595710c4fdeb892e9d44cbc77a13055b954920b64b20b29f2f65b797' 
  AND token = 'G9kAEcZ94a92eGK9q22om3qo9eQ0P/EhrBYjfWRJbzc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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