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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a9826180aaad0d9a116afaca990369cb796fe94338a4aaecb217380ea888f3cb' 
  AND token = '90OlEv34f8mso7T/IzVuUA+nYJaPxxXBh0+mLN6ktyc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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