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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '67a7e4e1d0367832a89ba8961d35ddfe4e1885d1a3d65052d583f8a0723480de' 
  AND token = 'mfjYqe+d1ZKr3AMCCLaOO2GvQHF8rb2z+aEJxhDmbJw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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