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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8c71319c58b103b3c814f9085eace165e0e9bdeb05998ff45da16d97aed19447' 
  AND token = 'Go8rI8vI7pxl41+GporM1o301BOodm3DrwXqKnNQDWE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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