SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6b993413d4d933d88c3e23360cc93f419f7071b54b271f277c82df52897ba2f9' 
  AND token = 'Bp5FUpaAMC+qFHcDU+HvDo015YVC76E7ZtX+KBH4/N0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00013

JSON explain

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