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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '70efa4d47514c46f508638e3fb01789f303757348383abd9e8da12e963455338' 
  AND token = 'wg05WNA3lSZD9x3Ylc4bjipKGMGLZEOD0uyTHV6omcA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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