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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '20e36fdad829cb9d39330c724432d3e5a72e880c7b5070b63d910947d85fa8ae' 
  AND token = 'x/wFdp4MPLNK1PojxQ7ZMZt8DzJeR89ytxodt0Q5zrM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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