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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0c7f2bd4327d6c17ae2a69e6fa6254e368381818e415107b48e4dd1d0c202993' 
  AND token = 'T8tGuDd0iup47ACwMbMxXO9E9PZa/jQQvTWaDerJdLE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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