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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '76b2af11ab0dd334a0d0117477f03922e2da312f6700d874eb1dbf8c99c3f775' 
  AND token = 'MbFbQrhDE1uSkqJ9JxpkLmUclK46nMhNfFzUGiIAhS8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00052

JSON explain

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