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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aa437c876a1f20df9a87b0635fa276642e007dc6c2828dc9b6ccc5839ccaadd1' 
  AND token = 'KFVIMf3WmZfIpEU1xg9ts7+d/2n27vsRHjg2UKHz+BU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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