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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b3886fdce2d7538393c8b445c6e60d4e8d87b787bbe94f75528d6e62429a5b71' 
  AND token = 'XjAZ8Tq+M0LsAjN81lZQkc4Lz28HGB50WlXmqQxXio4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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