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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '930fa1d93a80cd96ee84d046fbe2c0a062b0198790c67ecc7461c3edbc9546a0' 
  AND token = 'qM80rFBKz6d8Ou3e2Mc7hwh0+I8ceA4cOKRLXlRlzhA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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