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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b028120174d63b9a61534dc13e7ff84d60af7d056cec211c31eeeb1a1987b9b8' 
  AND token = 'uK9wCL5y1AUV54gzZi1i9X4NjiMpIIJfTw1ZSHOFXQo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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