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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '785aa234d8fecca8e41752613189712f4f7c0a7ff93d950913cb4adc2aa84845' 
  AND token = 'lJYUomHYkJb4LLeX8UiKAhCVBE3Pcsc1M8G/kgdKi7k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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