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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd6c38da4f364043b1ba26e9e068de8faf29b14c8cdccbc289555630583369341' 
  AND token = 'Xh6Hrx2sq+iqmtgGAS6pNiU+G6HfRyH80at/GyBfxss=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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