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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '41302729b910ec88c5ff807766a1b0e55873d57ee1fd910b14973b325c105872' 
  AND token = '0xn3WlvIF9GLcOz/Oi4VrzR2tP/un47Bv4tt0T7KY5s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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