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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1db925b4996abb7e5513c90092eb31d70a0a8f2a15bd2e27981a074e0b7dba24' 
  AND token = 'IHFw3BR/90nMbR2Ow0RN/wRhrYXE7t6xYKm8WbTHEkM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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