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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3c048a21cc0335563338f2fd373d8a9c50773bcdcdb15ff58c45cab33b8f4b9b' 
  AND token = 'NGNAS+Af9lVThlzd9RRDkMeNN/iCTaqt+p86+jGxjd4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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