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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dac428eceab7c89fc9015906f9cf17f7bb40849e2ca6cbfae26b6249d2ded08f' 
  AND token = '6I1oHeJBp3SvWT9sogHX7Xo+MgTw3UVyoay7jRYYLA0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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