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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '963a8e3fb48c15642107a3810dd172e7cc23c2c74cb2169627be3cd325fe4916' 
  AND token = '3l8DBem/3Pu8ptXOWs06XK7Hc8Ffg9T5GOgPihknOrA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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