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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '918779be4a44edecaedcbae435ee058ec560717447cd9a6068005b99191a21e8' 
  AND token = '25jzDx8J6feeBuTEziLTG2+ADYV1IJmPxpZ+7Got09A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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